[docs] [issue25874] Add notice that XP is not supported on Python 3.5+

[Chris Wilcox]

New submission from Chris Wilcox:

This is a documentation change to make it easier to discover that XP is not a supported OS.  Content was taken from the 'whats new' section and added to the top of the main article.

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assignee: docs at python
components: Documentation
files: add-supported-versions-section-windows.diff
keywords: patch
messages: 256473
nosy: crwilcox, docs at python
priority: normal
severity: normal
status: open
title: Add notice that XP is not supported on Python 3.5+
type: enhancement
versions: Python 3.5, Python 3.6
Added file: http://bugs.python.org/file41319/add-supported-versions-section-windows.diff

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<http://bugs.python.org/issue25874>
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